Journal
ASTROPHYSICAL JOURNAL
Volume 766, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/766/1/1
Keywords
Sun: activity; Sun: chromosphere; Sun: corona; Sun: UV radiation; techniques: spectroscopic
Categories
Funding
- National Research Foundation of Korea [R31-10016]
- Ministry of Education, Science and Technology
- Korea Research Foundation
- Korean Government (MOEHRD, Basic Research Promotion Fund) [KRF-2008-314-C00158, 20090071744, 20100014501]
- Korea Meteorological Administration/National Meteorological Satellite Center
- Construction of the Korean Space Weather Center
- project of KASI
- STFC [PP/D002907/1, ST/H000429/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H000429/1, PP/D002907/1] Funding Source: researchfish
- UK Space Agency [ST/J001732/1] Funding Source: researchfish
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We have investigated a coronal jet observed near the limb on 2010 June 27 by the Hinode/X-Ray Telescope (XRT), EUV Imaging Spectrograph (EIS), and Solar Optical Telescope (SOT), and by the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), and on the disk by STEREO-A/EUVI. From EUV (AIA and EIS) and soft X-ray (XRT) images we have identified both cool and hot jets. There was a small loop eruption seen in Ca II images of the SOT before the jet eruption. We found that the hot jet preceded its associated cool jet by about 2 minutes. The cool jet showed helical-like structures during the rising period which was supported by the spectroscopic analysis of the jet's emission. The STEREO observation, which enabled us to observe the jet projected against the disk, showed dimming at 195 angstrom along a large loop connected to the jet. We measured a propagation speed of similar to 800 km s(-1) for the dimming front. This is comparable to the Alfven speed in the loop computed from a magnetic field extrapolation of the photospheric field measured five days earlier by the SDO/Helioseismic and Magnetic Imager, and the loop densities obtained from EIS Fe XIV lambda 264.79/274.20 line ratios. We interpret the dimming as indicating the presence of Alfvenic waves initiated by reconnection in the upper chromosphere.
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